Car-spring



Patented Jan. 22, 1884..

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(No Model.)

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WITNESSES:

JJK LU I UNITED STATES PATENT Brion;

HARVEY J. MITCHELL, OF PHILADELPHIA, PENNSYLVANIAQ CAR-SPRING.

SPECIFICATION forming-part of Letters Patent No. 292,248, dated January 22, 1884. Application filed September 21, 1883. (No model.)

To all whom it may concern:

Be it known that I, HARVEY J. MITcHELL, of the city and county of Philadelphia, in the State of Pennsylvania, have invented certain new and useful Improvements in Gar-Springs, of which improvements the following is a specification.

My inventionrelates to that class of springs known as graduated, and employed chiefly as bolster and journal springs for railroad-cars, in which one helical spring is located within another, the two being so relatively arranged in connection with proper abutments as to be successively acted upon by applied pressure.

It is the object of my invention to economize the construction and increase the effectiveness of a spring of such character, and this I effect by providing improved means for arranging and supporting a series of inner and outer coils relatively to a casing, a removable seat-plate, and a cap-plate, as hereinafter fully set forth.

In the accompanying drawings, Figure l is a vertical central section througha bolster-v spring for railroad-cars embodying my invention; and Fig. 2, a horizontal section through the same, some of the coils being removed.

In the practice of my invention I provide a box or casing, A, of dimensions suitable to contain a nest or series of graduated springs,.

each of which is composed of an inner helictlly-coiled bar or rod, B, and an outer similarly-coiled bar or rod, B. Amovable cover or cap-plate, A, upon which rests the weight to be supported by the springs, is fitted upon the top of the casing A, within which the sevcoils, B, each of which is fitted into one of said openings, and rests therein upon the bottom of thecasing. An outer coil, B, surrounds each of the coils B, said outer coil resting upon the top of the seat-plate and bearing at its upper end against the lower side of the capplate, A, which is provided with a series of downward projections or stems, a, each of which fits within one of the outer coils, B, and acts as a guide to maintain the upper end of the same in proper position. The seatplate conforms in outline with the interior of the casing, or may be provided with one or more projections on each of its sides to abut against the walls thereof, so as to properly hold the lower ends of the inner coils as against displacement from their proper relative positions.

In operation, weight applied to the capplate acts first upon the outer coils, B, and upon the increase of the load sufficiently to compress the same to the level of the tops of the inner springs the latter are then brought into action in the usual manner of springs of this class. Y

It will be obvious that the inner and outer coils may be either of the same or of different heights, as preferred, as the difference between. the levels of their tops, due to the thick ness of the seat-plate, will afford sufiicient space forthe required compression of the outer coils. The seat-plate holds the entire series properly in position without the aid of bolts or other fastenings, and its insertion and removal or that of any one or more of the several coils can be readily effected whenever desired.

I am aware that a perforated washer adapt ed to receive a coil in its inner opening and support a surrounding coil is not new, and such, therefore, I do not claim. A multiple series of perforated washers, if employed in lieu of the seat-plate hereinbefore described, would differ substantially therefrom in the particular that with said washers there would be necessitated the useof bolts or other fastenings to enable them to maintain the proper relative location of the several coils, the ne cessity for which is obviated by my improvements.

I claim herein as my invention- 1. Aperforated seat-plate adapted to fit and be maintained in position horizontally within a box or casing, said seat-plate having aseries In testimony whereof I have hereunto set my hand.

HARVEY J. MITCHELL.

Witnesses:

.T. \V. HAMPTON, J12, H. XIonoLsoX. 

